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This CL has no functional changes.

The following cleanups were applied.

1) Made data members were const where applicable.
2) Added explicit {copy,move} {constructor,assignment} declarations.
3) Removed unnecessary default constructor.
4) Applied clang-tidy suggestion for push_back() -> emplace_back().

Change-Id: I5d3c55280f4a6020a743096cf603d90b135e875e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464979
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817168}